A Mount FS is a virtual filesystem which can seamlessly map sub-directories on to other filesystems

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Lets say we have two filesystems containing config files and resources respectively:
[config_fs]
|-- config.cfg
`-- defaults.cfg

[resources_fs]
|-- images
|   |-- logo.jpg
|   `-- photo.jpg
`-- data.dat
We can combine these filesystems in to a single filesystem with the following code:
from fs.mountfs import MountFS
combined_fs = MountFS()
combined_fs.mount('config', config_fs)
combined_fs.mount('resources', resources_fs)
This will create a filesystem where paths under config/ map to config_fs, and paths under resources/ map to resources_fs:
[combined_fs]
|-- config
|   |-- config.cfg
|   `-- defaults.cfg
`-- resources
    |-- images
    |   |-- logo.jpg
    |   `-- photo.jpg
    `-- data.dat
Now both filesystems may be accessed with the same path structure:
print(combined_fs.gettext('/config/defaults.cfg'))
read_jpg(combined_fs.open('/resources/images/logo.jpg', 'rb')


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